Stump cutter disc with recessed tooth pockets

ABSTRACT

One stump cutter cutting wheel disclosed herein includes a wheel structure having left and right sides and being rotatable about a central axis extending between the left and right sides. The left and right sides define receptacles having depths measured in an orientation extending along the axis. Cutter assemblies are mounted to the wheel structure and include cutters mounted to cutter holders. The cutter holders include base portions that fit within the receptacles, and the base portions each define at least one fastener opening. The base portions further define base thicknesses measured in the orientation extending along the axis. The receptacle depths are at least 0.25 times as large as the base thicknesses such that no more than 75 percent of the base thicknesses extend laterally outside the receptacles. Fasteners secure the cutter holders to the wheel structure and extend through the fastener openings defined by the base portions.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of, and claims priority to, U.S.patent application Ser. No. 14/147,277, filed Jan. 3, 2014, which claimspriority to U.S. Provisional Application 61/751,705 filed Jan. 11, 2013.

BACKGROUND

The present disclosure relates generally to material reduction machinesthat are adapted to be used to remove such items as tree stumps. Variousmethods and machines for removing or reducing the size of stumps areknown. Examples of stump reduction machines are disclosed in U.S. Pat.No. 6,014,996 titled Control System for Stump Cutters assigned toVermeer; U.S. Pat. No. 7,011,124 titled Stump Grinder Having AutomaticReversing Feed Assembly assigned to Tramo; U.S. Pat. No. 6,026,781titled Stump Cutter Safety System assigned to Rayco; and U.S. Pat. No.6,230,770 titled Stump Chipper and Method for the Operation Thereofassigned to Vermeer-Holland.

SUMMARY

In one embodiment of the current invention, a stump cutter cutting wheelincludes a wheel structure having a left side and a right side. Thewheel structure can be rotatable about a central axis that extendsthrough the wheel structure between the left and right sides. The leftand right sides of the wheel structure define multiple receptacles thathave receptacle depths measured in an orientation that extends along thecentral axis. Multiple cutter assemblies can be mounted to the wheelstructure. The cutter assemblies include cutters mounted to cutterholders. The cutter holders include base portions that fit within thereceptacles and the base portions each define at least one fasteneropening. The base portions define base thicknesses measured in theorientation that extend along the central axis. The receptacle depthscan be at least 0.25 times as large as the base thicknesses such that nomore than 75 percent of the base thicknesses extend laterally outside ofthe receptacles. The stump cutter cutting wheel includes fasteners forsecuring the cutter holders to the wheel structure. The fasteners extendthrough the fastener openings defined by the base portions of the cutterholders.

Another aspect of the disclosure includes a stump cutter cutting wheelincluding a main wheel that has a left side and a right side. The mainwheel can be rotatable about a central axis that extends through themain wheel between the left and right surfaces. Guard structures can bemounted to the left and right surfaces of the main wheel. The guardstructures are formed by plates fastened to the main wheel. The platesdefine openings that define receptacles and the receptacles have innerand outer ends. The receptacles have depths that extend from the innerends to the outer ends of the receptacles. The depths can be measured inan orientation that extends along the central axis of the main wheel.The inner ends are closed by the left and right surfaces of the mainwheel and outer ends being open. The stump cutter cutting wheel includesmultiple cutter assemblies including cutters mounted to cutter holders.The cutter holders include base portions that fit within the receptaclesand the base portions each define at least one fastener opening. Thestump cutter cutting wheel includes fasteners for securing the cutterholders to the main wheel. The fasteners extend through the fasteneropenings defined by the base portions of the cutter holders and engagethe main wheel.

A further aspect of the disclosure includes a stump cutter cutting wheelincluding a wheel structure that has a left side and a right side. Thewheel structure can be rotatable about a central axis that extendsthrough the wheel structure between the left and right sides. The leftand right sides of the wheel structure define multiple receptacles thathave receptacle depths measured in an orientation that extends along thecentral axis. The stump cutter cutting wheel includes multiple cutterassemblies mounted to the wheel structure. The cutter assemblies includecutters mounted to cutter holders and the cutter holders include baseportions that fit within the receptacles. The base portions each defineat least one fastener opening. The stump cutter cutting wheel includesfasteners for securing the cutter holders to the wheel structure. Thefasteners extend through the fastener openings defined by the baseportions of the cutter holders. The receptacles define receptacleoutlines and the base portions define base portion outlines. A majorityof each receptacle outline has a clearance of at least 0.2 inches withrespect to the base portion outline of a corresponding one of the baseportions.

Another aspect of the disclosure relates to a design that reduces theamount of debris thrown from the wheel structure while cuttingassemblies cut and grind, for example, a tree stump.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is perspective view of a self-propelled stump cutterincorporating a stump cutter cutting wheel in accordance with theprinciples of the present disclosure;

FIG. 2 is an enlarged view of the portion of the self-propelled stumpcutter and stump cutter cutting wheel shown in FIG. 1;

FIG. 3 is a side perspective view of the stump cutter cutting wheelshown in FIG. 1;

FIG. 4 is an enlarged view of a cutter assembly shown in FIG. 3; and

FIG. 5 is across-sectional view of the stump cutter cutting wheel shownin FIG. 3 taken along line A-A.

DETAILED DESCRIPTION

An exemplary embodiment will be described in detail with reference tothe drawings, wherein like reference numerals represent like parts andassemblies throughout the several views. Reference to the embodimentdoes not limit the scope of the claims attached hereto. Additionally,any examples set forth in this specification are not intended to belimiting and merely set forth some of the many possible embodiments forthe inventive aspect disclosed herein.

The present disclosure relates generally to a stump cutter for improvedoperation below ground where tooth mount pockets are mounted such thatthey are recessed into the stump cutter disc. In one example, thepockets are mounted so that they are recessed into the stump cutter discsuch that the outer surface of the pocket is approximately co-planarwith the outside surface of the stump cutter disc. The stump cutterreduces drag on the stump cutter wheel when it is submerged, either inthe ground or in chips of wood. The stump cutter also reduces thetendency for the stump cutter wheel to throw material.

FIG. 1 illustrates perspective view of a self-propelled (i.e.walk-behind) stump cutter 10 having a stump cutter cutting wheel 12 onthe front thereof which rotates about a substantially horizontal axis 14as it sweeps in contact with, for example, a tree stump. The stumpcutter 10 includes a chassis 16 (i.e., a mainframe) including a firstend 18 and a second end 20. A sub frame 22 attaches to the chassis 16 ata swing axis 24. The sub frame 22 sweeps or pivots along swing axis 24,which is substantially vertical, toward a stump to be grounded. Thestump cutter 10 includes a boom 26 that attaches to the sub frame 22 atpivot axis 28. A lift cylinder 30 pivotally connected to the sub frame22 enable the boom 26 to pivot relative to the chassis 16 about a pivotaxis 28. The lift cylinder 30 can be a hydraulic cylinder arranged toraise and lower the boom 26. A drive motor 32 is located on a side ofthe boom 26 to drive the stump cutter cutting wheel 12. The stump cutter10 includes a control panel 34 mounted to the chassis 16 such that itcan be positioned at the second end 20 of the chassis 16. The stumpcutter 10 includes a propulsion structure 36 (i.e. wheel, rubber track,steel track etc.) that can be mounted on the chassis 16 to move thestump cutter 10 across a floor or ground.

FIG. 2 illustrates an enlarged portion of FIG. 1 showing the stumpcutter cutting wheel 12. The stump cutter cutting wheel 12 includes awheel structure 38, multiple cutter assemblies 40, and fasteners 42. Thewheel structure 38 has a left side 44 and a right side 46 and may berotated about the horizontal axis 14 that extends through the wheelstructure 38 between the left and right sides 44, 46. The left and rightsides 44, 46 of the wheel structure 38 define multiple receiving areas(or “receptacles”) 48. The receptacles 48 may have a measured depth inan orientation that extends along the horizontal axis 14. The wheelstructure 38 includes multiple cutter assemblies 40 that are mounted andsecured thereon using the fasteners 42. The cutter assemblies 40 areillustrated and described in more detail with reference to FIGS. 3-5.

FIGS. 3-5 illustrate features of the stump cutter cutting wheel 12.

FIG. 3. is a side view of the stump cutter cutting wheel 12. In thisexample, the stump cutter cutting wheel 12 includes guard plates 50, amain wheel 52 and bolts 54 for attaching the stump cutter cutting wheel12 to the drive motor 32. The cutting wheel 12 defines an opening 11 forreceiving the drive motor 32 that is attached to the boom 26. It is tobe understood that the features shown in FIG. 3 are also depicted on theopposite side of the stump cutter cutting wheel 12 such that both leftand right 44, 46 of the wheel structure 38 are representative of eachother. The left and right 44, 46 sides may each include at least twoguard plates 50.

The guard plates 50 shown in FIG. 3 are fastened to the main wheel 52with fasteners 42. In an example, the guard plates 50 may have athickness of between about 0.5 to 0.25 inches. The guard plates 50 eachhave a first side 56 and a second side 58. The second sides 58 of theguard plates 50 define multiple receptacles 48 positioned around theperiphery of the guard plates 50. The receptacles 48 define receptacleoutlines 60. It is to be understood that the receptacle outlines 60 maybe configured in various shapes.

FIG. 4 is an enlarged view of a portion of FIG. 3 depicting the cutterassemblies 40. The cutter assemblies 40 include cutters 62 that areconfigured to mount to cutter holders 64. The cutter holders 64 includebase portions 66 that fit within the receptacles 48. The base portions66 define at least one opening 68 for receiving the fastener 42. Theguard plates 50 are mounted to the stump cutter cutting wheel structure38 such that the cutter holders 64 are recessed into the stump cuttercutting wheel 12. In this example, the design of the guard plates 40help to eliminate the amount of debris that is thrown from the stumpcutter cutting wheel 12.

Turning to FIG. 5, a cross-sectional view is shown of the stump cuttercutting wheel 12. The base portions 66 define a base thickness T thatcan be measured in the orientation that extends along the horizontalaxis 14. In an example, the base thickness T can be between 1.0 and 0.5inches. In this example, the receptacles 48 may have a depth D of atleast 0.25 times as large as the base thickness such that no more than75 percent of base thickness extends laterally outside of thereceptacles 48. In other embodiments, the receptacle depth may be atleast 0.30 times as large as the base thickness such that no more than70 percent of the base thickness extends laterally outside of thereceptacles 48. In another embodiment, the receptacle depth may be atleast 0.35 times as large as the base thickness such that no more than65 percent of the base thickness extends laterally outside of thereceptacles 48. Still, in other embodiments the receptacle depth may beat least 0.40 times as large as the base thickness such that no morethan 60 percent of the base thickness extends laterally outside of thereceptacles 48 or be at least 0.45 times as large as the base thicknesssuch that no more than 55 percent of the base thickness extendslaterally outside of the receptacles 48.

The base portions 66 define base portion outlines 70 (FIG. 4).Generally, the receptacle outlines 60 may follow the overall shape ofthe base portion outlines 70. In this example, a majority of thereceptacle outlines 60 have a clearance C1 of at least 0.2 inches withrespect to the base portion outlines 70. It is to be understood that theclearance may vary in other embodiments according to the disclosure.

In accordance with another aspect of the disclosure, the main wheel 52of the stump cutter cutting wheel 12 has a left surface 72, a rightsurface 74, and an outermost border 75 (a border that is furthest fromthe horizontal axis 14). In this example, the stump cutter cutting wheel12 includes a left guard mounted to the left surface 72 and a rightguard mounted to the right surface 74. The left and right guards eachinclude at least one guard plate. The left and right guards may coverouter annular regions of the left and right surfaces 72, 74 of the mainwheel 52. The outer annular regions may extend around the horizontalaxis 14. In other embodiments, the left and right guards may not coverinner annular regions of the left and right surfaces 72, 74 of the mainwheel 52. In other embodiments, the left and right guards cover 20-60percent of the total areas defined by the left and right surfaces 72, 74of the main wheel 52.

In this example, the left and right guards each include first and secondplates that cooperate to cover the outer annular regions. The first andsecond plates may have a semi-circular shape. It is understood that theshape of the plates may vary. The left and right guards define openings76 that partially define the receptacles 48. The openings 76 can benotches having open sides that face radially outwardly from thehorizontal axis 14.

Referring again to FIG. 4, the cutter holders 64 may have leading sides78 and trailing sides 80. The cutter holders 64 may include cutterfastener openings that extend through the cutter holders 64 from theleading sides 78 to the trailing sides 80. The cutters 62 includecutting heads 82 positioned at the leading sides 78 of the cutterholders 64 and fasteners 84 of the cutters 62 extend through the cutterfastener opening.

In accordance with another aspect of the disclosure, the receptacles 48may have an inner and outer end and a depth that extends from the innerend to the outer end. The depth may be measured in an orientation thatextends along the horizontal axis 14 of the main wheel 52. The innerends may be closed by the left and right surfaces 72, 74 of the mainwheel 52, and the outer ends may be open.

From the forgoing detailed description, it will be evident thatmodifications and variations can be made without departing from thespirit and scope of the disclosure.

What is claimed is:
 1. A cutting wheel, comprising: a main wheelrotatable about a center axis; the main wheel having a generally planarleft surface, a generally planar right surface, and an outermost border;the left surface being generally parallel to the right surface; aplurality of cutter assemblies extending from the main wheel beyond theoutermost border, each cutter assembly having a base portion and acutter configured for reducing material; a guard extending a distance D1normal to one of the left surface and the right surface, the guarddefining a receiving area; wherein: one of the cutter assembly baseportions is positioned in the receiving area; the cutter assembly baseportion in the receiving area extends a distance D2 from the one of theleft surface and the right surface; the distance D2 being measured inthe orientation that extends along the center axis; the distance D1 isat least 25% as large as the distance D2; and the guard is fastened tothe one of the left surface and the right surface by fasteners.
 2. Thecutting wheel of claim 1, further comprising two guards, one guardextending a distance D1 from the left surface, and another guardextending the distance D1 from the right surface.
 3. The cutting wheelof claim 2, wherein each of the guards includes at least two guardplates.
 4. The cutting wheel of claim 3, wherein each guard covers anouter annular region of the left and right surfaces of the main wheel,respectively, and wherein the outer annular regions extend around thecentral axis.
 5. The cutting wheel of claim 1, wherein the receivingarea is at least 0.30 times as large as the base portion of the cutterassembly such that no more than 70 percent of the base portion extendslaterally outside of the receiving area.
 6. A stump cutter cutting wheelcomprising: a wheel structure having a left side and a right side, thewheel structure being rotatable about a central axis that extendsthrough the wheel structure between the left and right sides, the wheelstructure defining an outermost border and concordant outer annularregions associated with the left and right sides of the wheel structure;a right guard secured to the right side of the wheel structure, and aleft guard secured to the left side of the wheel structure, each guardcomprising a plate having an arced configuration with an inside edge andan undulating outside edge defining at least one receptacle therein; aplurality of cutter assemblies mounted to the wheel structure, thecutter assemblies including cutters mounted to cutter holders, thecutter holders including base portions that fit correspondingly withinthe receptacles; and fasteners for securing the cutter holders to thewheel structure, the fasteners extending through the fastener openingsdefined by the base portions of the cutter holders; and wherein theright guard and the left guard are positioned on respective outerannular regions of the right and left sides of the wheel structure. 7.The cutting wheel of claim 6, wherein each of the left and right guardsis generally semi-circular.
 8. The cutting wheel of claim 7, wherein theleft and right guards each include at least two guard plates, the guardplates being generally semi-circular.
 9. The cutting wheel of claim 8,wherein the respective guard plates of the left and right guards arecooperatively secured to the respective left and right sides of thewheel structure to cover the outer annular regions of the wheelstructure.
 10. The cutting wheel of claim 7, wherein each guard coversan outer annular region of the left and right surfaces of the wheelstructure, and wherein the outer annular regions extend around thecentral axis.
 11. The cutting wheel of claim 6, wherein the left andright guards are offset from the outer-most border of the wheelstructure.
 12. A cutting wheel, comprising: a main wheel having acircumference; the main wheel being rotatable about a center axis andcomprising a generally planar left surface, a generally planar rightsurface, and an outermost border; the left surface being generallyparallel to the right surface; a first guard extending along an annularregion of one of the left surface and the right surface, the guardcomprising a plate having an arced configuration with an inside edge andan undulating outside edge defining at least one receiving area therein;and a cutter assembly mounted to the wheel structure, the cutterassembly including cutters mounted to cutter holders, the cutter holdersincluding base portions that fit correspondingly within the receivingarea, the base portions each defining at least one fastener opening, thebase portions defining base thicknesses measured in the orientation thatextends along the central axis, the receptacle depths being at least0.25 times as large as the base thicknesses such that no more than 75percent of the base thicknesses extend laterally outside of thereceptacles, the base portions each defining at least one fasteneropening.
 13. The cutting wheel of claim 12, wherein the first guard isoffset from the outermost border of the main wheel.
 14. The cuttingwheel of claim 12, wherein the guard extends a distance D1 normal to theone of the left surface and the right surface.
 15. The cutting wheel ofclaim 14, wherein the cutter assembly base portion in the receiving areaextends a distance D2 normal to the one of the left surface and theright surface.
 16. The cutting wheel of claim 15, wherein D2 is greaterthan D1.
 17. The cutting wheel of claim 12, wherein the guard is asemi-circle extending partially along the circumference of the mainwheel.
 18. The cutting wheel of claim 12, wherein the guard is circularand extends along the circumference of the main wheel, the guard havinga central bore formed therein.
 19. The cutting wheel of claim 12,further comprising a second guard, wherein the first guard extends alongan annular region of the left surface of the main wheel and the secondguard extends along an annular region of the right surface of the mainwheel.
 20. The cutting wheel of claim 19, wherein the first and secondguard each include at least two guard plates, and wherein the guard arecooperatively secured to the respective left and right sides of the mainwheel to cover the outer annular regions of the main wheel.